Gelduba: Roman fort, part of the Rhine limes, modern Krefeld-Gellep.
The wooden fort had at least three occupation phases until it was rebuilt out of stone in the mid-second century. It offered accommodation to a squadron of cavalry (the cohors II Varcinorum equitata), which was still there in the third century. In 256/257, the Franks destroyed Gelduba. A mass grave has been excavated in an underground temple of Mithras. Immediately, the fort was rebuilt, probably by the first Gallic emperor, Postumus. During his reign, the people revolted against him, but the rebellion was suppressed, and the emperor restored the bathhouse that had been destroyed. The building inscription, in a fine, classical writing, survives.
The new castle continued to be in use until the Franks again destroyed the site in 275. In ca. 295 the site was reoccupied by Roman soldiers, and although there was a crisis in 353-355, the settlement survived more or less intact until the Franks took over the area at the beginning of the fifth century. There's an interesting tomb from the sixth century of a Frankisch warrior named Arpvar.
The civil settlement and river port of Gelduba were still functioning in the second half of the eighth century - there were large cemeteries, which have been excavated. Today, Gelduba/Gellep is a part of modern Krefeld. The excavated Roman cemeteries are among the largest in the world.